Don't render invisibles with elements (#20841)

Turns out that in the case you have a somehow valid utf-8 file that
contains almost all ascii control characters, we run out of element
arena space.

Fixes: #20652

Release Notes:

- Fixed a crash when opening a file containing a very large number of
ascii control characters on one line.

crates/gpui/src/text_system/line_layout.rs

@@ -29,7 +29,7 @@ pub struct LineLayout {
 }
 
 /// A run of text that has been shaped .
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct ShapedRun {
     /// The font id for this run
     pub font_id: FontId,